Quote Originally Posted by hilariusmind View Post
The weirdest thing is that once I got it working on Kubuntu 9.10 (I remember to have only blacklisted the b43 module), it still worked on through all 10.04 upgrade and updates until 10.10. After upgrading from 10.04 to 10.10 wireless kept working. Then, after one 10.10 update I could not get the wireless interface to work anymore. Every time I power on my notebook the wireless led stays orange (it is supposed to be blue until you press the switch to kill wireless and turn it orange).
Just to answer my own question in case anybody else was facing the same problem: something in the update had just blocked the card. All you have to do is unblock it.

So, you have to install the drivers (in my case b43-fwcutter, firmware-b43-lpphy-installer):

sudo aptitude install b43-fwcutter firmware-b43-lpphy-instaler
And then you have to run:

sudo rfkill unblock all
That's it.

I've found that solution on this other thread